ISO 9388-1992 镍合金 磷含量测定 钼蓝分子吸收光谱法

标准号：ISO 9388-1992
中文标准名称：镍合金 磷含量测定 钼蓝分子吸收光谱法
英文标准名称：Nickel alloys; determination of phosphorus content; molybdenum blue molecular absorption spectrometric method
标准类型：H62
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：H62
国际标准分类号：77.120.40
适用范围：Phosphorus content can be determined in the range of 0,001 % (m/m) to 0,025 % (m/m). Cr(III) and silica cause interference which is eliminated. The principle is dissolution of a test portion in a mixture of nitric and hydrochloric acids, fuming with sulfuric acid, oxidation of Cr(III) to Cr(VI), precipitation of Fe(III) phosphate and redissolution of the precipitate, addition of boric, tartaric and sulfamic acids, formation and extraction of molybdophosphoric acid, reduction of the heteropoly acid to molybdenum blue and back-extraction into an aqueous phase, measurement of the absorbance of the aqueous solution at 700 nm.